Construction method and joint structure

Abstract

To provide a construction method which enables easy repair of a connection part of two pipes.SOLUTION: A construction method is used to provide a joint structure (10) for connecting a first opening (1a) with a second opening (2a). The joint structure includes a stacking ring member (3) in which a plurality of ring members are engaged with each other and stacked. The construction method includes: a first insertion step in which an upper ring member (31) is disposed in a position such that the upper ring member surrounds a first pipe; a second insertion step in which a lower ring member (34) is disposed in a position such that the lower ring member surrounds the second opening of a second pipe; and an engagement step in which the ring members are engaged with each other so that the stacking ring member covers a gap between the first opening and the second opening.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a construction method for a joint structure and a joint structure. [Background technology]

[0002] Conventionally, a drainage structure has been known in which rainwater and the like that falls on the road surface of expressways (elevated roads) and the like is drained by a steel pipe that is embedded in the deck and extends downward from the underside of the deck, and a PVC (polyvinyl chloride) pipe that is installed along the pier and connected to the steel pipe. Here, the inside diameter of the upper end of the PVC pipe is slightly larger than the outside diameter of the lower end of the steel pipe, and the upper end of the PVC pipe covers the lower end of the steel pipe, thereby connecting the PVC pipe to the steel pipe. Cited Document 1 discloses, as a drainage structure for expressways, a manhole body that extends downward from the underside of the deck, and a pipe that connects to the lower part of the manhole body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-227052 A Summary of the Invention [Problem to be solved by the invention]

[0004] In drainage structures on expressways, defects such as cracks are likely to occur at the connection between the steel pipe and the PVC pipe. Causes of this include hardening of the PVC pipe due to ultraviolet rays, expansion of the steel pipe due to rust, and differences in vibration between the steel pipe buried in the deck and the PVC pipe installed along the bridge pier.

[0005] In the conventional drainage structure, if a defect occurs in the connection, the entire PVC pipe including the connection must be replaced. However, the PVC pipes installed along the bridge piers often have a unique shape corresponding to the structure of the expressway. Manufacturing PVC pipes with such unique shapes requires a lot of time and cost, as well as the skill of workers. Therefore, in the conventional drainage structure, there is a problem that it is not easy to repair the connection between the steel pipe and the PVC pipe.

[0006] An object of one aspect of the present invention is to provide a joint structure that can facilitate repair of a connection between two pipes. [Means for solving the problem]

[0007] In order to solve the above problems, an installation method according to a first aspect of the present invention is an installation method for providing a joint structure for connecting a first opening of a fixed first pipe and a second opening of a fixed second pipe, the joint structure comprising a laminated ring member in which a plurality of ring members engage with each other and are stacked to cover the gap between the first opening and the second opening, the installation method including: a preparation step for preparing a first ring member and a second ring member, the plurality of ring members being a first ring member and a second ring member; a first insertion step for inserting the first ring member into the gap between the first pipe and the second pipe and arranging the first ring member in a position surrounding the first pipe; a second insertion step for inserting the second ring member into the gap between the first pipe and the second pipe and arranging the second ring member in a position surrounding the second opening of the second pipe; and an engagement step for engaging the plurality of ring members with each other so that the laminated ring member covers the gap between the first opening and the second opening.

[0008] The installation method according to aspect 2 of the present invention may further include, after the engagement step, a covering step of covering a portion of the first tube, a portion of the second tube, and the periphery of the laminated ring member with a heat shrink film.

[0009] In order to solve the above problems, a joint structure according to a third aspect of the present invention is a joint structure for connecting a first opening of a first pipe and a second opening of a second pipe, comprising a laminated ring member in which a plurality of ring members are stacked and engaged with each other to cover a gap between the first opening and the second opening, the plurality of ring members including a first ring member surrounding the periphery of the first opening and a second ring member surrounding the periphery of the second opening, the second ring member having a portion into which the second pipe can be inserted and an inner extension portion extending radially inward from an inner surface into which the second pipe abuts, the entire first ring member being capable of inserting the first pipe.

[0010] In a joint structure according to a fourth aspect of the present invention, in the above-mentioned third aspect, the plurality of ring members may further include at least one third ring member located between the first ring member and the second ring member.

[0011] In the joint structure according to a fifth aspect of the present invention, in the third or fourth aspect, each of the plurality of ring members may have a thread for screwing together with the other ring members.

[0012] The joint structure according to a sixth aspect of the present invention may be any one of the third to fifth aspects, further comprising a second packing that seals between the second pipe and the second ring member.

[0013] The joint structure according to a seventh aspect of the present invention may be any one of the third to sixth aspects, further comprising a first packing for sealing between the first pipe and the first ring member.

[0014] In the joint structure according to an eighth aspect of the present invention, in any one of the third to seventh aspects, a minimum inner diameter of the first ring member may be larger than an inner diameter of the inward extension portion of the second ring member. Effect of the Invention

[0015] According to one aspect of the present invention, the connection between two pipes can be easily repaired. [Brief description of the drawings]

[0016] [Figure 1] 1 is a cross-sectional view taken along an arrow A showing a configuration of a joint structure according to an embodiment of the present invention; [Diagram 2] 4 is a cross-sectional view showing detailed configurations of a lower ring member in a stacked ring member of the joint structure and a second packing of the joint structure. FIG. [Diagram 3] 5 is a schematic diagram showing the flow of a construction method for the above-mentioned joint structure. FIG. [Figure 4] 5 is a schematic diagram showing the flow of a construction method for the above-mentioned joint structure. FIG. [Diagram 5] 5 is a schematic diagram showing the flow of a construction method for the above-mentioned joint structure. FIG. [Figure 6] 5 is a schematic diagram showing the flow of a construction method for the above-mentioned joint structure. FIG. [Figure 7] 5 is a schematic diagram showing the flow of a construction method for the above-mentioned joint structure. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] [Embodiment 1] (Schematic configuration of drainage structure 100) FIG. 1 is an arrow cross-sectional view showing the configuration of a joint structure 10 applied to a drainage structure 100 for draining rainwater and the like that falls on a road surface of an expressway (elevated road) or the like. The drainage structure 100 includes a first pipe 1, a second pipe 2, and the joint structure 10. The first pipe 1 is a pipe member that is embedded in a deck and extends downward from the lower surface of the deck. The first pipe 1 is typically a steel pipe. The second pipe 2 is a pipe member that is installed along a pier. The second pipe 2 is typically a PVC pipe. Note that FIG. 1 shows only a portion of the first pipe 1 (a portion that extends downward from the lower surface of the deck) and a portion of the second pipe (an upper end portion).

[0018] The first tube 1 has a first opening 1a facing downward. The second tube 2 has a second opening 2a facing upward. The first opening 1a and the second opening 2a are spaced apart at a predetermined interval.

[0019] The first pipe 1 and the second pipe 2 are based on the existing fixed first pipe 1A and the existing fixed second pipe 2A in the conventional drainage structure, respectively (see FIG. 3). Specifically, the first pipe 1 is the existing first pipe 1A itself in the conventional (before repair) drainage structure. On the other hand, the second pipe 2 is the existing second pipe 2A in the conventional (before repair) drainage structure from which the sleeve portion 21A, which is the connection portion with the existing first pipe 1A, has been removed. The inner diameter of the sleeve portion 21A is slightly larger than the outer diameter of the existing first pipe 1A, and the sleeve portion 21A covers the lower end of the existing first pipe 1A, thereby connecting the existing second pipe 2A to the existing first pipe 1A.

[0020] For example, in a conventional drainage structure installed on expressways, etc., the existing first pipe 1A is a steel pipe buried in the deck and extending downward from the underside of the deck. The existing second pipe 2A is a PVC pipe installed along a pier and connected to the existing steel pipe. In particular, in such conventional drainage structures installed on expressways, etc., defects are likely to occur in the sleeve portion 21A due to the difference in vibration between the steel pipe buried in the deck and the PVC pipe installed along the pier.

[0021] (Detailed configuration of joint structure 10) The joint structure 10 is a member for connecting a first opening 1a of a first pipe 1 and a second opening 2a of a second pipe 2. As shown in FIG. 1, the joint structure 10 includes a laminated ring member 3, a first packing 4, and a second packing 5.

[0022] The laminated ring member 3 covers the gap between the first opening 1a and the second opening 2a in front view (when viewed from the normal direction of the outer surfaces of the first pipe 1 and the second pipe 2). In other words, the upper end of the laminated ring member 3 is above the first opening 1a, and the lower end of the laminated ring member 3 is below the second opening 2a. The laminated ring member 3 is stacked with a plurality of ring members engaged with each other. The height of each of the plurality of ring members is smaller than the height (gap) between the first opening 1a and the second opening 2a. This is because each of the plurality of ring members is inserted into the gap between the first pipe 1 and the second pipe 2, as will be described later with reference to Figures 4 to 5. The material of the laminated ring member 3 is, for example, a resin such as PVC, or a metal such as stainless steel (SUS).

[0023] According to this configuration, the first pipe 1 and the second pipe 2 can be connected by the joint structure 10, which is a member separate from the first pipe 1 and the second pipe 2. Therefore, when a defect occurs in the sleeve portion 21A of the existing second pipe 2A, the connection portion of the first pipe 1 and the second pipe 2 can be repaired by removing the sleeve portion 21A and providing the joint structure 10 between the first pipe 1 and the second pipe 2. In other words, when a defect occurs in the sleeve portion 21A of the existing second pipe 2A, it is not necessary to replace the entire existing second pipe 2A as in the conventional case. Therefore, the connection portion of the first pipe 1 and the second pipe 2 can be easily repaired.

[0024] The multiple ring members include at least an upper ring member 31 (first ring member) surrounding the periphery of the first opening 1a, and a lower ring member 34 (second ring member) surrounding the periphery of the second opening 2a. The multiple ring members may further include at least one or more intermediate ring members (third ring members) located between the upper ring member 31 and the lower ring member 34. In the example shown in FIG. 1, the at least one or more intermediate ring members are composed of a first intermediate ring member 32 on the upper ring member 31 side and a second intermediate ring member 33 on the lower ring member 34 side. That is, in the example shown in FIG. 1, the stacked ring member 3 is composed of four ring members.

[0025] The lower ring member 34 has a portion into which the second tube 2 can be inserted (a second inner extension portion 343 and a downward extension portion 344 described later) and a first inner extension portion 342 (inner extension portion) that extends radially inward from the inner surface and abuts against the second tube 2. That is, the first inner extension portion 342 extends at least to the upper edge portion of the second tube 2 and is placed on the second tube 2. The inner diameter of the lower ring member 34 at the first inner extension portion 342 is smaller than the outer diameter of the second tube 2 (in the example shown in FIG. 1, it is approximately equal to the inner diameter of the second tube 2). In addition, the lower ring member 34 has a second inner extension portion 343 that extends radially inward from the inner surface below the first inner extension portion 342. The inner diameter of the lower ring member 34 at the second inner extension portion 343 is approximately the same as the outer diameter of the second tube 2 or slightly larger than the outer diameter of the second tube 2. According to this configuration, the laminated ring member 3 is reliably supported by the second tube 2.

[0026] On the other hand, the entire upper ring member 31 can insert the first pipe 1. That is, the minimum inner diameter of the upper ring member 31 is larger than the outer diameter of the first pipe 1. The minimum inner diameter of the upper ring member 31 may be larger than the inner diameter of the first inner extension portion 342 of the lower ring member 34. With this configuration, the first pipe 1 and the second pipe 2 having approximately the same outer diameter can be connected. In addition, for example, a gap is formed between the first pipe 1 and the upper ring member 31. Therefore, the gap can absorb the left-right vibration of the first pipe 1 relative to the second pipe 2. Therefore, the possibility of defects occurring due to the left-right vibration of the first pipe 1 relative to the second pipe 2 can be reduced. The gap is sealed by the first packing 4 described later.

[0027] Each of the multiple ring members has a thread for screwing with the other ring members. In detail, each of the multiple ring members except for the lower ring member 34 has a first thread (e.g., a male thread) on the side surface of the lower end. Also, each of the multiple ring members except for the upper ring member 31 has a second thread (e.g., a female thread) on the side surface of the upper end. The multiple ring members engage with each other as each first thread engages with the corresponding second thread. To improve water-stopping properties, an adhesive may be filled in the area where the first thread and the second thread engage.

[0028] In the example shown in FIG. 1, the upper ring member 31 is formed so that the outer diameter at the lower end 312 is smaller than that at other portions. A first thread 312a is formed on the outer surface of the lower end 312. The first intermediate ring member 32 is formed so that the inner diameter at the upper end 321 is larger than that at other portions. A second thread 321a that meshes with the first thread 312a of the upper ring member 31 is formed on the inner surface of the upper end 321. The upper ring member 31 engages with the first intermediate ring member 32 by the first thread 312a meshing with the second thread 321a. Note that the first thread 312a may be formed on the inner surface of the lower end 312, and the second thread 321a may be formed on the outer surface of the upper end 321.

[0029] Similarly, the first intermediate ring member 32 is formed so that the outer diameter at the lower end 322 is smaller than the other portions. A first thread 322a is formed on the outer surface of the lower end 322. The second intermediate ring member 33 is formed so that the inner diameter at the upper end 331 is larger than the other portions. A second thread 331a that meshes with the first thread 322a of the first intermediate ring member 32 is formed on the inner surface of the upper end 331. The first thread 322a meshes with the second thread 331a, whereby the first intermediate ring member 32 engages with the second intermediate ring member 33.

[0030] Similarly, the second intermediate ring member 33 is formed so that the outer diameter at the lower end 332 is smaller than the other portions. A first thread 332a is formed on the outer surface of the lower end 332. The lower ring member 34 is formed so that the inner diameter at the upper end 341 is larger than the other portions. A second thread 341a that meshes with the first thread 332a of the second intermediate ring member 33 is formed on the inner surface of the upper end 341. The second intermediate ring member 33 engages with the lower ring member 34 by the first thread 332a meshing with the second thread 341a.

[0031] According to this configuration, an operator can easily engage each of the multiple ring members with the other ring members by simply rotating each of the multiple ring members about an axis relative to the other ring members.

[0032] A groove 311 is formed along the circumferential direction in the vertical middle part of the inner surface of the upper ring member 31. A ring-shaped first packing 4 is provided between the first pipe 1 and the groove 311 of the upper ring member 31. The first packing 4 seals between the first pipe 1 and the upper ring member 31. The first packing 4 includes a flexible material such as rubber. With this configuration, the first packing 4 can fix the upper ring member 31 to the first pipe 1 while preventing wastewater from leaking between the first pipe 1 and the upper ring member 31 (i.e., the waterproofing property of the laminated ring member 3 can be improved).

[0033] The lower ring member 34 has a downward extension 344 extending downward from the second inner extension 343. The inner diameter of the lower ring member 34 at the downward extension 344 is larger than the outer diameter of the second pipe 2. That is, a gap is formed between the second pipe 2 and the downward extension 344 of the lower ring member 34. A ring-shaped second packing 5 is provided between the second pipe 2 and the downward extension 344 of the lower ring member 34. The second packing 5 seals between the second pipe 2 and the lower ring member 34. The second packing 5 includes a flexible material such as rubber. According to this configuration, the second packing 5 fixes the lower ring member 34 to the second pipe 2 while preventing drainage from leaking between the second pipe 2 and the lower ring member 34 (that is, the waterproofing of the laminated ring member 3 can be improved). The detailed structure of the second packing 5 will be described later with reference to FIG. 2.

[0034] Fig. 2 is a cross-sectional view showing a detailed configuration of the lower ring member 34 and the second packing 5 installed in the lower ring member 34. Reference numeral 2001 in Fig. 2 indicates one example of the configuration of the lower ring member 34. Reference numeral 2002 in Fig. 2 indicates another example of the configuration of the lower ring member 34. Note that in Fig. 2, reference numeral 2001 does not show the second packing 5. Also, Fig. 2 shows only one of the longitudinal cross sections of the lower ring member 34 and the second packing 5, which are ring-shaped.

[0035] As shown by reference numeral 2001 in FIG. 2, the lower ring member 34 may have an intermediate protrusion 344a protruding radially inward at the vertical intermediate portion of the downward extension 344. The lower ring member 34 may also have a lower end protrusion 344b protruding radially inward at the lower end of the downward extension 344. In this case, the second packing 5 is provided between the second inner extension 343 and the lower end protrusion 344b. The second packing 5 has a groove portion that fits with the intermediate protrusion 344a at a position corresponding to the intermediate protrusion 344a. With this configuration, the second packing 5 can be more firmly fixed between the second pipe 2 and the downward extension 344.

[0036] Alternatively, as shown by reference numeral 2002 in FIG. 2, the lower ring member 34 may have a lower end protrusion 344b protruding radially inward at the lower end of the downward extension 344. In an example shown by reference numeral 2002 in FIG. 2, the lower ring member 34 does not have an intermediate protrusion 344a. Meanwhile, the second packing 5 has a first portion 5a, a second portion 5b, and a third portion 5c. The first portion 5a abuts against a part of the inner surface of the downward extension 344 and the upper surface of the lower end protrusion 344b. The second portion 5b extends outward as it moves upward from the first portion 5a, and abuts against a part of the inner surface of the downward extension 344 and the lower surface of the second inner extension 343. The third portion 5c extends inward as it moves upward from the first portion 5a. When the second tube 2 is inserted into the lower ring member 34, the third portion 5c is pressed outward by the outer surface of the second tube 2. According to such a configuration, the water blocking ability of the second packing 5 can be further improved.

[0037] (Method of constructing joint structure 10) 3 to 7 are schematic diagrams showing the flow of a construction method for the joint structure 10. Hereinafter, with reference to Fig. 3 to Fig. 7, a construction method for repairing a connection portion when a defect occurs in the sleeve portion 21A, which is a connection portion between an existing first pipe 1A and an existing second pipe 2A in a conventional drainage structure (as indicated by reference symbol S1 in Fig. 3), will be described.

[0038] First, as shown by reference symbol S1 in FIG. 3, an operator determines the position of a cutting plane of the existing second pipe 2A in order to remove the sleeve portion 21A from the existing second pipe 2A. The cutting plane is a plane perpendicular to the axial direction of the existing second pipe 2A. The position of the cutting plane is determined so that the first opening 1a of the first pipe 1 and the second opening 2a of the second pipe 2 are separated by a predetermined interval. The position of the cutting plane is shown by a dotted line at reference symbol S1 in FIG. 3.

[0039] Next, the worker cuts the existing second pipe 2A based on the determined position of the cutting plane, as shown by reference symbol S2 in Figures 3 and 4. As a result, the first pipe 1 and the second pipe 2 remain in the drainage structure 100. Here, the first opening 1a of the first pipe 1 and the second opening 2a of the second pipe 2 are separated by a predetermined interval.

[0040] Next, the worker prepares the upper ring member 31 and the lower ring member 34 (preparation step). Here, the worker installs the second packing 5 on the lower ring member 34 (for example, as described above with reference to FIG. 2). In this embodiment, the worker further prepares the first intermediate ring member 32 and the second intermediate ring member 33 according to the predetermined interval between the first opening 1a and the second opening 2a. That is, the worker prepares four ring members according to the predetermined interval between the first opening 1a and the second opening 2a. Note that the number of the multiple ring members to be prepared is not limited to this, and may be appropriately selected based on the predetermined interval between the first opening 1a and the second opening 2a.

[0041] Next, the worker inserts the first packing 4 into the gap between the first pipe 1 and the second pipe 2, as shown by reference symbol S3 in Fig. 4. Next, the worker moves the first packing 4 upward and inserts the first pipe 1 into the ring-shaped first packing 4. Then, the worker places the first packing 4 in a position where it surrounds the periphery of the first pipe 1.

[0042] Next, the worker inserts the upper ring member 31 into the gap between the first pipe 1 and the second pipe 2 (first insertion step), as shown by reference symbol S4 in Fig. 4. Next, the worker moves the upper ring member 31 upward and inserts the first pipe 1 into the upper ring member 31. Then, the worker places the upper ring member 31 in a position where it surrounds the periphery of the first pipe 1.

[0043] 4 and 5, the worker similarly places the first intermediate ring member 32 and the second intermediate ring member 33 in order at positions surrounding the periphery of the first pipe 1. By the operations indicated by the symbols S3 to S5, the first packing 4, the upper ring member 31, the first intermediate ring member 32, and the second intermediate ring member 33 are temporarily placed above the first opening 1a of the first pipe 1. This ensures a space for inserting the lower ring member 34 into the gap between the first pipe 1 and the second pipe 2.

[0044] Next, as shown by the reference symbol S6 in FIG. 5 and FIG. 6, the worker inserts the lower ring member 34 into the gap between the first pipe 1 and the second pipe 2 (second insertion step). Next, the worker moves the lower ring member 34 downward and inserts the second pipe 2 into a part of the lower ring member 34 (the second inner extension part 343 and the downward extension part 344). Then, the worker places the lower ring member 34 in a position surrounding the second opening 2a of the second pipe 2. That is, the worker places the lower ring member 34 in a position surrounding the radial direction of the second opening 2a of the second pipe 2. In detail, the first inner extension part 342 of the lower ring member 34 is placed on the second pipe 2, so that the downward movement of the lower ring member 34 is restricted (see FIG. 1). When the second pipe 2 is inserted into a part of the lower ring member 34, the second packing 5 installed in the lower ring member 34 is placed between the second pipe 2 and the downward extension part 344.

[0045] Next, as shown by symbols S7 and S8 in Fig. 6, the worker engages the multiple ring members with each other so that the laminated ring member 3 covers the gap between the first opening 1a and the second opening 2a (engagement step). That is, as shown by symbol S7 in Fig. 6, the second intermediate ring member 33 and the first intermediate ring member 32 are moved downward in order to engage with the lower ring member 34 and the second intermediate ring member 33, respectively. Then, as shown by symbol S8 in Fig. 6, the worker moves the upper ring member 31 downward to engage with the first intermediate ring member 32. In the steps shown by symbols S7 and S8, the worker may fill adhesive into the places where each first thread and the corresponding second thread engage with each other.

[0046] Next, as indicated by reference symbol S9 in FIGS. 6 and 7, the worker moves the first packing 4 downward and fits it between the first pipe 1 and the groove 311 (see FIG. 1).

[0047] According to the above configuration, the plurality of ring members are inserted one by one into the gap between the first pipe 1 and the second pipe 2, and the plurality of ring members are engaged with each other to form the laminated ring member 3 that covers the gap between the first opening 1a and the second opening 2a. Therefore, compared with the conventional construction method in which the entire existing second pipe 2A is replaced, the materials (each member constituting the joint structure 10) handled in the construction method according to this embodiment are of a size that can be handled by one worker. Therefore, the installation construction of the joint structure 10 can be facilitated. In particular, in construction at a high place such as repairing the drainage structure 100 on a highway, it is advantageous in terms of efficiency to handle the size of the materials handled to a size that can be handled by one worker. In addition, it is not necessary to prepare a replacement for the existing second pipe 2A, which has a different bending shape for each location. Furthermore, the construction of the joint structure 10 is possible with a minimum cutting operation, such as removing only the sleeve portion 21A of the existing second pipe 2A.

[0048] After the step indicated by reference symbol S9, the worker may cover a part of the first pipe 1, a part of the second pipe 2, and the periphery of the laminated ring member 3 with a heat shrink film 6, as indicated by reference symbol S10 in FIG. 7 (covering step). In detail, the worker surrounds a part of the first pipe 1, a part of the second pipe 2, and the periphery of the laminated ring member 3 with the heat shrink film 6. Then, the worker heats the heat shrink film 6 to a heat shrink temperature. With this configuration, the water-stopping property of the drainage structure 100 can be further improved, and the laminated ring member 3 can be firmly fixed to the first pipe 1 and the second pipe 2.

[0049] Also, the first packing 4 may be attached to the upper ring member 31 in advance (before the construction of the joint structure 10) (for example, may be fitted into the groove 311). In this case, the step indicated by reference symbol S3 in Fig. 4 is omitted, and the first packing 4 together with the upper ring member 31 is disposed in a position surrounding the periphery of the first pipe 1 by the step indicated by reference symbol S4 in Fig. 4. Also, the first packing 4 together with the upper ring member 31 is moved downward by the step indicated by reference symbol S8 in Fig. 6, and the step indicated by reference symbol S9 in Figs. 6 and 7 is omitted.

[0050] (Additional Notes) In the above embodiment, an example in which the joint structure 10 is applied to the drainage structure 100 of an expressway (elevated road) has been described, but the application example is not limited to this. For example, the joint structure 10 can be used for repairing drainage pipes in bridges and the like.

[0051] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0052] 1 1st pipe 1a 1st opening 2 2nd pipe 2a 2nd opening 3. Laminated ring members 4. First packing 5 Second packing 6 Heat shrink film 10 Joint structure 31 Upper ring member (first ring member) 32 First intermediate ring member (third ring member) 33 Second intermediate ring member (third ring member) 34 Lower ring member (second ring member) 100 Drainage structure 312a, 322a, 332a 1st thread (thread) 321a, 331a, 341a 2nd thread (thread) 342 First inner extension part (inner extension part) 343 Second inner extension part

Claims

1. A construction method for providing a joint structure for connecting a first opening of a fixed first pipe and a second opening of a fixed second pipe, comprising: The first pipe and the second pipe are already fixed to each other before the joint structure is constructed, The joint structure includes a laminated ring member in which a plurality of ring members are engaged with each other and laminated to cover a gap between the first opening and the second opening, a preparation step of preparing the plurality of ring members, which are a first ring member, a second ring member, and a plurality of third ring members; a first insertion step of inserting the first ring member into a gap between the first pipe and the second pipe and disposing the first ring member in a position surrounding the first pipe; a second insertion step of inserting the second ring member into a gap between the first pipe and the second pipe and disposing the second ring member at a position surrounding the second opening of the second pipe; a third insertion step of inserting each of the plurality of third ring members into a gap between the first tube and the second tube, and arranging the plurality of third ring members at a position between a position where the first ring member is arranged and a position where the second ring member is arranged, thereby adjusting a length of the stacked ring members; and an engagement step of engaging the plurality of ring members with each other so that the stacked ring members cover the gap between the first opening and the second opening.

2. The construction method according to claim 1 , further comprising, before the first insertion step, a removal step of removing a portion of a connected pipe to separate the first pipe and the second pipe.

3. 3. The installation method according to claim 1, further comprising a covering step of covering a portion of the first tube, a portion of the second tube, and the periphery of the stacked ring member with a heat shrink film after the engaging step.

4. A joint structure for connecting a first opening of a first pipe and a second opening of a second pipe, a stacked ring member including a plurality of ring members stacked in mutual engagement to cover a gap between the first opening and the second opening; the plurality of ring members include a first ring member surrounding the periphery of the first opening and a second ring member surrounding the periphery of the second opening, the second ring member has a portion into which the second tube can be inserted, and an inner extension portion extending radially inward from an inner surface thereof and against which the second tube abuts; The first tube can be inserted into the entire first ring member, The plurality of ring members further includes at least one third ring member positioned between the first ring member and the second ring member.

5. The joint structure according to claim 4 , wherein an outer diameter of the first ring member, an outer diameter of the second ring member, and an outer diameter of the third ring member in the laminated ring members are the same.

6. 6. The joint structure according to claim 4, wherein each of the plurality of ring members has a thread for threadably engaging with another ring member.

7. The joint structure according to claim 4 or 5, further comprising a second packing for sealing between a second pipe and the second ring member.

8. The joint structure according to claim 4 or 5, further comprising a first packing for sealing between the first pipe and the first ring member.

9. 6. A joint structure as claimed in claim 4 or 5, wherein a minimum inside diameter of the first ring member is greater than an inside diameter of the inward extension of the second ring member.

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